Update summarize_release.py

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancements to the release summary script for better efficiency and accuracy.

📊 Key Changes

• Added a time.sleep(30) to ensure PR summaries are up-to-date after a merge.
• Modified PR processing to sort pull requests from earliest to latest.

🎯 Purpose & Impact

• 🕒 Ensures accurate data retrieval by allowing time for systems to update post-merge.
• 🔍 Improves the order of PRs for clearer timeline presentation, enhancing readability.

[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting an ultralytics/actions 🚀 PR! This is an automated response to help ensure a smooth integration of your changes. An Ultralytics engineer will also review your PR soon. Meanwhile, please go over the following checklist:

• ✅ Define a Purpose: Ensure your PR description clearly explains the purpose of your updates and link to any relevant issues. Please verify that your commit messages are clear and follow the project's conventions.
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• ✅ Update Documentation: Modify any relevant documentation if there are new features or changes.
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